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This open cluster is formally numbered NGC 1662 and is located in the constellation Orion, so you'll need to catch it just after the sun sets.

Another fun asterism is Stargate. This small grouping is a striking geometric pattern that could be the portal to other universes. Well, not really, but it is fun to look at and can be found just southwest of Messier 104.

Stargate appears as a triangle of stars within another triangle of stars and is quite an intriguing sight. It's more appealing as a visual target and doesn't seem quite as interesting when photographed, which is why you probably won't find many images of it.

Another favorite that's easy to find in binoculars is Napoleon's Hat. It looks exactly like a hat that Napoleon would have worn and can be found just south of Arcturus in the constellation Bootes.

While observing Napoleon's Hat, it's best to keep Arcturus out of the field of view; otherwise the hat seems to do a hat trick and disappears!

If you'd like to hunt for more asterisms, there's a nice listing of them at saguaroastro.org.